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Research on Microstructure and Mechanical property of 4032 Aluminum Alloy Scroll

Author: ChenLan
Tutor: DanBin
School: Harbin Institute of Technology
Course: Materials Engineering
Keywords: 4032 aluminum allov Scroll Heat treatment Mechanical property
CLC: TG319
Type: Master's thesis
Year: 2011
Downloads: 32
Quote: 0
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Abstract


Recently, with the rapidly development of auto industry, people pay moreattention to lighting vehicle, and high silicon aluminum alloy are widely used in automanufacturers because of its excellent mechanical properties. The forging technologyof high silicon aluminum has been researched widely by people, now people beganto research about the microstructures and mechanical properties of forgings.The material of this article researching about is 4032 aluminum alloy which isthe material of scroll in auto air conditioning, this material has good performances instrength, wear and so on. Firstly, this article researched the microstructure evolutionof 4032 alloy by heat treatment. This alloy contains Si 12% which showed granularmorphology, and some secondary phase Mg2Si, Al2Cu which enhance the alloy.Under 520℃solution and keep 3.5 hours, the secondary phases could totallydissolved into Al base and the Si particles wouldn’t grow up. Under 150℃~165℃aging for 8~10 hours, the secondary phases could separate out again and the Siwouldn’t change its morphology.For further define the method of heat treatment to 4032 aluminum alloy, thisarticle made mechanical properties test to the bar of 4032 aluminum allov whichwere heated. The mechanical properties test included: strength, toughness, hardness,wear. Through testing, according the actual work needs of scroll, we founded thealloy has better mechanical properties under 165℃aging 8 hours.Through researching the molding quality of 4032 aluminum allov scroll, wefound that: the height of scroll would be different if the counterpressure wasn’tenough; and the streamline of scroll bended because of the deformation. Addressthese issues above, we analysis the reason and proposed improvements. Then weheated the scroll by 520℃solution 3.5 hours and 165℃aging 8 hours, throughobserving microstructure ,we found the effect of heat treatment is obvious. But wealso found as-cast microstructure in scroll, and part of microstructure had directions.Then we test mechanical properties of scroll, its mechanical properties meet therequirements of scroll, and are nearly to the 4032 aluminum allov bar, so we couldimprove the heat treatment.

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CLC: > Industrial Technology > Metallurgy and Metal Craft > Metal pressure processing > Forging, forging and blacksmith > Non-ferrous metal forging
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